Number Line

Why is a number line
used?

A number
line is used to represent numbers, such as fractions, whole numbers, integers,
etc.

For drawing
a number line; draw a line of some suitable length and mark points on it so
that the line is divided into required equal parts. Mark its middle point as
zero. Towards the right of zero, mark the numbers +1, +2, +3,…… etc. at equal
distances and towards the left of zero, mark -1, -2, -3,…… etc. at the same equal
distances. Mark arrow heads at both the ends of the number line to show that
the lines as well as the numbers continue upto infinity on the negative side
and also on the positive side.